# text.div
This code system http://hl7.org/fhir/observation-referencerange-normalvalue defines the following codes:

Code | Display | Definition
negative | Negative | The expected normal value for the observation is negative.
absent | Absent | The expected normal value for the observation is absent.

# description
Codes that describe the normal value in the reference range.

# concept[].definition
The expected normal value for the observation is negative.

# concept[].definition
The expected normal value for the observation is absent.